16 
THE ART OF REARING 
Lastly, the third change is that of the chrysalis 
into the perfect animal or moth, which also takes 
place in the cocoon. 
The caterpillar, in that latter change, not only 
attains the state of perfect animal, but in the 
female the formation of the eggs takes place, and 
in the male the impregnating liquid is secreted. 
The change of the aurelia into the moth takes 
place, as I before stated, in a covering enclosed 
within the cocoon ; the aurelia, on being entirely 
converted into the moth, rends this covering as 
•well as the cocoon, and leaves the various en- 
velopes which confined it. 
The moths then couple, and the female depo- 
sits her eggs in the spot where they are best shel- 
tered from cold, rain, or other accidents. 
The term of existence in moths varies ; there 
are some who live through the winter, and do 
not deposit their eggs till spring. 
The males and females die very shortly after 
the deposition of the impregnated eggs. 
6 th. Of the Means used by Nature to destroy 
Caterpillars, thus preventing their unbounded 
Increase; means which may also be used by 
Man to diminish their Numbers. 
The labourer, a constant spectator of the havoc 
made by caterpillars, cannot imagine that pro- 
vident nature should have bestowed such a curse on 
